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QSI 683 WS(-8) cover with t-thread and cap

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Looking for a replacement cover for my QSI 683.  This item (QSI-AC6-WS8Cover) is used to cover the filter wheel when the wsg guide port is removed from the camera to decraese back focus.  I believe the same cover is used for 500/600 series cameras.  Need one wth the t-thread.